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How to Generator Inter-site Topology And Site link Transitivity

  • ISTG is responsible for generating an inbound replication connection for bridge head servers within a site.
  • The first server in the site is responsible for ISTG
  • If the ISTG becomes unavailable, after 60 minutes a new ISTG will take over.
  • ISTG is responsible for determining the active bridgehead server

 

  • By default, bridge all site links is turned on. This allows for the automatic creation of transitive links.
  • Site link between Site A and B, and another site link between Site B and C.
  • A transitive link will be established between Site A and Site B. The cost of the transitive link will be the sum of the two created site links between A, B and C.
  • Transitive links will only be used if a site link becomes unavailable.
  • Problem: What if no network connectivity exists between site A and C?
  • Turn off bridge all site links.
  • If you want other site links to still be transitive, you need to create a site link bridge.
  • In the example above, if bridge all site links is disabled, you can still establish a transitive link between Site A and Site C by creating a site link bridge with the two site links as members.